iPhone developer and hacker Jonathan Zdziarski said that the iPhone is incredibly poor when it comes to security:
Jonathan Zdziarski, an iPhone developer and a hacker who teaches forensics courses on recovering data from iPhones, hasn't been very impressed with the iPhone's security -- or lack thereof. Mr. Zdziarski has indicated that iPhone OS v3.0 is a bit better when it comes to security, but he says with only a few pieces of readily available freeware you can easily crack it in under two minutes. That news must be concerning for the corporations and government agencies that support the hundreds of thousands of business iPhones Apple says it has sold.
Mr. Zdziarski says the iPhone's security woes are entirely unnecessary and are the result of incompetence. He states, "It is kind of like storing all your secret messages right next to the secret decoder ring. I don’t think any of us [developers] have ever seen encryption implemented so poorly before, which is why it’s hard to describe why it’s such a big threat to security."